/*
    * Copyright 2009 Red Hat, Inc.
    *
    * Red Hat licenses this file to you under the Apache License, version 2.0
    * (the "License"); you may not use this file except in compliance with the
    * License.  You may obtain a copy of the License at:
    *
    *    http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package org.jboss.netty.handler.codec.http2;
  
  import java.io.IOException;
  
  import org.jboss.netty.buffer.ChannelBuffer;
  import org.jboss.netty.buffer.ChannelBuffers;
  
  /**
   * Disk implementation of Attributes
   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
   * @author Andy Taylor (andy.taylor@jboss.org)
   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
   * @author <a href="http://openr66.free.fr/">Frederic Bregier</a>
   *
   */
  public class DiskAttribute extends AbstractDiskHttpData implements Attribute {
      public static String baseDirectory = null;
  
      public static boolean deleteOnExitTemporaryFile = true;
  
      public static String prefix = "Attr_";
  
      public static String postfix = ".att";
  
      /**
       * Constructor used for huge Attribute
       * @param name
       */
      public DiskAttribute(String name) {
          super(name, HttpCodecUtil.DEFAULT_CHARSET, 0);
      }
      /**
       *
       * @param name
       * @param value
       * @throws NullPointerException
       * @throws IllegalArgumentException
       * @throws IOException
       */
      public DiskAttribute(String name, String value)
              throws NullPointerException, IllegalArgumentException, IOException {
          super(name, HttpCodecUtil.DEFAULT_CHARSET, 0); // Attribute have no default size
          setValue(value);
      }
  
      public HttpDataType getHttpDataType() {
          return HttpDataType.Attribute;
      }
  
      public String getValue() throws IOException {
          byte [] bytes = get();
          return new String(bytes, charset);
      }
  
      public void setValue(String value) throws IOException {
          if (value == null) {
              throw new NullPointerException("value");
          }
          byte [] bytes = value.getBytes(charset);
          ChannelBuffer buffer = ChannelBuffers.wrappedBuffer(bytes);
          if (definedSize > 0) {
              definedSize = buffer.readableBytes();
          }
          setContent(buffer);
      }
  
      @Override
      public void addContent(ChannelBuffer buffer, boolean last) throws IOException {
          int localsize = buffer.readableBytes();
          if (definedSize > 0 && definedSize < size + localsize) {
              definedSize = size + localsize;
          }
          super.addContent(buffer, last);
      }
      @Override
      public int hashCode() {
          return getName().hashCode();
      }
  
      @Override
      public boolean equals(Object o) {
          if (!(o instanceof Attribute)) {
              return false;
          }
         Attribute attribute = (Attribute) o;
         return getName().equalsIgnoreCase(attribute.getName());
     }
 
     public int compareTo(InterfaceHttpData arg0) {
         if (!(arg0 instanceof Attribute)) {
             throw new ClassCastException("Cannot compare " + getHttpDataType() +
                     " with " + arg0.getHttpDataType());
         }
         return compareTo((Attribute) arg0);
     }
 
     public int compareTo(Attribute o) {
         return getName().compareToIgnoreCase(o.getName());
     }
 
     @Override
     public String toString() {
         try {
             return getName() + "=" + getValue();
         } catch (IOException e) {
             return getName() + "=IoException";
         }
     }
 
     protected boolean deleteOnExit() {
         return deleteOnExitTemporaryFile;
     }
 
     protected String getBaseDirectory() {
         return baseDirectory;
     }
 
     protected String getDiskFilename() {
         return getName()+postfix;
     }
 
     protected String getPostfix() {
         return postfix;
     }
 
     protected String getPrefix() {
         return prefix;
     }
 }